【Qt编程】基于Qt的词典开发系列十四自动补全功能

#ifndef WIDGET_H
#define WIDGET_H#include <QWidget>
#include<QMouseEvent>namespace Ui {
class Widget;
}class Widget : public QWidget
{Q_OBJECTpublic:explicit Widget(QWidget *parent = 0);~Widget();void mousePressEvent(QMouseEvent *event);
private:Ui::Widget *ui;
signals:void movesignal();
};#endif // WIDGET_H

#ifndef COMPLETELINEEDIT_H
#define COMPLETELINEEDIT_H
#include <QLineEdit>
#include <QStringList>
#include<QFile>
#include<QTextCodec>
#include<QDebug>
class QListView;
class QStringListModel;
class QModelIndex;
class CompleteLineEdit : public QLineEdit {Q_OBJECT
public:CompleteLineEdit(QStringList words, QWidget *parent = 0);
public slots:void setCompleter(const QString &text); // 动态的显示完成列表void completeText(const QModelIndex &index); // 点击完成列表中的项，使用此项自动完成输入的单词
protected:virtual void keyPressEvent(QKeyEvent *e);virtual void focusOutEvent(QFocusEvent *e);
private slots:void replyMoveSignal();
private:QStringList words; // 整个完成列表的单词QListView *listView; // 完成列表QStringListModel *model; // 完成列表的model
};
#endif // COMPLETELINEEDIT_H

#include "widget.h"
#include "ui_widget.h"Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget)
{ui->setupUi(this);
}Widget::~Widget()
{delete ui;
}void Widget::mousePressEvent(QMouseEvent *event)
{emit movesignal();
}

#include "CompleteLineEdit.h"
#include <QKeyEvent>
#include <QListView>
#include <QStringListModel>
#include <QDebug>
CompleteLineEdit::CompleteLineEdit(QStringList words, QWidget *parent): QLineEdit(parent), words(words)
{listView = new QListView(this);//用于显示下拉列表model = new QStringListModel(this);listView->setWindowFlags(Qt::ToolTip);//设置下拉列表的样式connect(this, SIGNAL(textChanged(const QString &)), this, SLOT(setCompleter(const QString &)));connect(listView, SIGNAL(clicked(const QModelIndex &)), this, SLOT(completeText(const QModelIndex &)));
}void CompleteLineEdit::focusOutEvent(QFocusEvent *e)
{//  listView->hide();//当输入行不是焦点时，隐藏自动补全的下拉列表
}void CompleteLineEdit::replyMoveSignal()
{listView->hide();//当输入行不是焦点时，隐藏自动补全的下拉列表
}void CompleteLineEdit::keyPressEvent(QKeyEvent *e)
{if (!listView->isHidden()){int key = e->key();int count = listView->model()->rowCount();QModelIndex currentIndex = listView->currentIndex();if (Qt::Key_Down == key){// 按向下方向键时int row = currentIndex.row() + 1;if (row >= count){row = 0;}QModelIndex index = listView->model()->index(row, 0);listView->setCurrentIndex(index);} else if (Qt::Key_Up == key){// 按向下方向键时int row = currentIndex.row() - 1;if (row < 0){row = count - 1;}QModelIndex index = listView->model()->index(row, 0);listView->setCurrentIndex(index);} else if (Qt::Key_Escape == key){// 按下Esc键时隐藏完成列表listView->hide();} else if (Qt::Key_Enter == key || Qt::Key_Return == key){// 按下回车键时，使用完成列表中选中的项，并隐藏完成列表if (currentIndex.isValid()){QString text = listView->currentIndex().data().toString();setText(text);}listView->hide();} else{// 其他情况，隐藏完成列表，并使用QLineEdit的键盘按下事件listView->hide();QLineEdit::keyPressEvent(e);}} else{QLineEdit::keyPressEvent(e);}
}void CompleteLineEdit::setCompleter(const QString &text)
{if (text.isEmpty())//没有输入内容的情况{listView->hide();return;}if ((text.length() > 1) && (!listView->isHidden())){return;}// 如果完整的完成列表中的某个单词包含输入的文本，则加入要显示的完成列表串中QStringList sl;foreach(QString word, words){//填充模式一if (word.contains(text))//只要包含该输入内容就显示，这里也可以设置大小写不敏感{sl << word;}//填充模式二
//        if(word.indexOf(text,0,Qt::CaseInsensitive)==0)//必需与句首内容相同
//            sl<<word;}model->setStringList(sl);listView->setModel(model);if (model->rowCount() == 0){return;}// 设置列表的显示位置及大小listView->setMinimumWidth(width());listView->setMaximumWidth(width());QPoint p(0, height());int x = mapToGlobal(p).x();int y = mapToGlobal(p).y() + 1;listView->move(x, y);listView->show();
}void CompleteLineEdit::completeText(const QModelIndex &index)
{QString text = index.data().toString();setText(text);listView->hide();
}